If you don't want to light your fireworks by hand and have an old cell phone you don't mind taking apart you can impress your friends by building a phone-triggered circuit to light the fuses and light the fireworks by calling the cell phone. In addition to the cell phone you'll need about five bucks worth of electronic components, model rocket fuses, and a soldering iron.

Technology DIY forum ZOMGstuff.net user Mr. Hasselhoff gives a full step-by-step tutorial at the source link below, but what you're basically doing is soldering two wires to the speaker output circuit so that when the phone rings the current flows to the trigger of a thyristor which will then send current to alligator clips cliped to your rocket fuses. You can optionally add a battery pack with switch to the setup off since the thyristor will continue to send voltage even after the call ends.

Aside from impressing your friends, this is also a way to discreetly detonate fireworks should you live in an area that discourages their use. Make sure that you obey standard firework safety protocols.